Preheat your oven to 400°F and prepare a large baking sheet.
Chop the broccoli, red bell pepper, and zucchini into uniform bite-sized pieces and finely mince the garlic cloves.
Toss the chopped vegetables and minced garlic on the baking sheet with 0.5 tablespoons of olive oil, 0.125 teaspoons of sea salt, and 0.125 teaspoons of black pepper.
Roast the vegetables in the oven for 15 to 20 minutes until they are crisp-tender and slightly caramelized.
While the vegetables roast, season the chicken breast evenly with the dried oregano and the remaining sea salt and black pepper.
Heat the remaining 0.5 tablespoons of olive oil in a heavy skillet over medium-high heat.
Place the chicken in the skillet and sear for 6 to 7 minutes per side until it develops a golden crust and reaches an internal temperature of 165°F.
Remove the chicken from the heat and let it rest for 3 minutes before serving alongside the vibrant roasted vegetables.